Experimental analysis of a gas-fired absorption heat pump with a refrigerant cooled flue gas heat exchanger

摘要

Residential heating has a significant potential in the reduction of energy consumption and CO_2emissions. A relevant contribution can be expected from gas-fired ammonia/water absorption heatpumps (GAHPs).Commonly the return flow of the heat distribution system is used to cool the combustion gas belowthe dew point to condensate water vapour and to minimize latent heat losses. Especially in retrofitapplications the temperature of the heat distribution system is too high to condensate water vapour.To use the latent heat under all operating conditions, a GAHP can be equipped with a refrigerantcooled flue gas heat exchanger between the evaporator and the absorber. Therefore, an increasein efficiency can be achieved.Measurements were carried out to determine the increase in efficiency using a refrigerant cooledflue gas heat exchanger. The GAHP was operated at different operating conditions and differentcycle configurations.